<template>
  <el-container class="home-container">
    <!--头部区域-->
    <el-header>
      <div>
        <!-- <img src="../assets/logo.png" alt=""> -->
        <span>后台管理系统</span>
      </div>
      <el-button type="info" @click="logout"> 退出 </el-button>
    </el-header>
    <!-- 页面主体部分-->
    <el-container>
      <!--侧边栏-->
      <el-aside :width="isCollapse ? '64px' : '200px'">
        <div class="toggle-button" @click="toggleCollapse">|||</div>
        <!--侧边栏菜单区域-->
        <el-menu background-color="#2f3440" text-color="#fff" active-text-color="#34a0f5" 
        unique-opened :collapse="isCollapse" :collapse-transition="false" router :default-active="activePath">
          <!--一级菜单-->
          <el-submenu :index="item.id+''" v-for="item in menuList" :key="item.id">
            <!--一级菜单的模板区域-->
            <template slot="title">
              <!--图标-->
              <i :class="iconsObj[item.id]"></i>
              <!--文本-->
              <span>{{item.label}}</span>
            </template>
            <!--二级菜单-->
            <el-menu-item :index="'/' + subItem.path" v-for="subItem in item.children" 
            :key="subItem.id" @click="saveNavState('/' + subItem.path)">
              <!--一级菜单的模板区域-->
              <template slot="title">
                <!--图标-->
                <i class="el-icon-menu"></i>
                <!--文本-->
                <span>{{ subItem.label }}</span>
              </template>
            </el-menu-item>
           
           
          </el-submenu>

        </el-menu></el-aside>
      <!--右侧内容主体-->
      <el-main>
        <!--路由占位符-->
        <router-view></router-view>
      </el-main>
    </el-container>
  </el-container>
</template>

<script>
export default {
  data(){
    return {
      // 左侧菜单数据
      menuList: [],
      iconsObj: {
        3:'el-icon-user-solid',
        5:'el-icon-s-tools',
        1:'el-icon-s-goods',
        8:'el-icon-s-order',
        9:'el-icon-s-data'
      },
      // 是否折叠
      isCollapse: false,
      // 被激活的链接地址
      activePath: ''
    }
  },
  created(){
    this.getMenuList(),
    this.activePath = window.sessionStorage.getItem('activePath')
  },
  methods: {
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    },
    // 获取所有的菜单
    async getMenuList(){
      const {data:res} = await this.$http.get('menu/treeselect')
      if(res.code !== 0) return this.$message.error('获取菜单失败')
      this.menuList = res.data
    },
    // 点击按钮菜单折叠或展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse;
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath', activePath);
      this.activePath = activePath;
    }

  },
}
</script>

<style lang="less" scoped>
.home-container {
  height: 100%;
}

.el-header {
  background-color: #282c34;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color: #fff;
  font-size: 20px;

  >div {
    display: flex;
    align-items: center;

    span {
      margin-left: 15px;
    }
  }
}

.el-aside {
  background-color: #2f3440;
  .el-menu {
    border-right: none;
  }
}

.el-main {
  background-color: #e6eaee;
}

.iconfont{
  margin-right: 10px;
}
.toggle-button{
  background-color: #414a5d;
  font-size: 10px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: 0.2em;
  cursor: pointer;
}
</style>
